When it comes to manufacturing large hollow plastic parts, nothing beats the process of rotomolding. Compared to other molding or casting processes like injection or blow molding, rotomolding is exceptionally cost efficient and the products produced are also of better quality.

Compression Molding Process

What is Compression Molding?

Compression molding is a high-volume, high-pressure method of molding used to produce larger flat or moderately curved parts such as hoods, fenders, scoops, spoilers, lift gates and the like for automotive end-uses. Even before plastic existed, this method was widely used in the bakery industry to mold cookies and cakes. There are number of manufacturers, suppliers and exporters in India, offering hi-tech compression moulding machine.

Types of Compression Molding:

Cap Compression Molding

Injection Compression Molding

Plastic Cap Compression Molding

Plastic Compression Molding

Rotary Compression Molding

Rotational Compression Molding

The Compression Moulding Process:

In this method, the material (which is generally in its granular or putty like form) is first heated and placed in the oven or heated mold cavity. The mold is then closed and subjected to pressure so that the molten material is distributed evenly in the mold cavity. It has to be noted that it is very important to maintain a consistent heat and pressure till the molding materials are cured. The machines used in compression molding are found in a wide range of shapes and sizes. Generally, these presses are powered by a hydraulic ram so that sufficient force is produced.

Raw Materials Commonly Used in Compression Moulding Process:

Polyester fiberglass resin systems (SMC/BMC)

Polyester

Polyimide (PI)

Polyamide-imide (PAI)

Fiber reinforced plastics

Poly(p-phenylene sulfide) (PPS)

Different grades of Polyetheretherketone (PEEK).

A few important considerations to be kept in mind while executing the process of compression molding: